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arXiv · 2203.08218

New predictions for radiation-driven, steady-state mass-loss and wind-momentum from hot, massive stars III. Updated mass-loss rates for stellar evolution

R. Björklund·J. O. Sundqvist·S. M. Singh·J. Puls·F. Najarro
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Abstract

Massive stars lose a large fraction of their mass to radiation-driven winds throughout their entire life. These outflows impact both the life and death of these stars and their surroundings. Theoretical mass-loss rates of hot, massive stars are derived to be used in applications such as stellar evolution. The behaviour of these rates in the OB-star regime is analysed, and their effects on massive-star evolution predictions is studied. Dynamically-consistent models are computed by solving the spherically symmetric, steady-state equation-of-motion for a large grid of hot, massive stars. The radiative acceleration is derived from non-local thermodynamic equilibrium radiative transfer in the co-moving frame. The resulting mass-loss rates are used to derive a simple scaling recipe with stellar parameters and to evaluate some first impacts upon evolution tracks. We provide a new prescription for steady-state, radiation-driven mass-loss from hot, massive stars depending on their fundamental parameters. The rates for O-stars are lower by about a factor ~3 than the rates typically used in previous stellar-evolution calculations, where differences generally decrease with increasing luminosity and temperature. For cooler B-giants/supergiants we find larger discrepancies. This arises because we do not find any systematic increase in mass-loss rates below the so-called bi-stability region; indeed, our results do not show any sign of a significant bi-stability jump within the parameter range covered by the grid. Due to the lower mass-loss rates we find that envelopes are not easily stripped by means of standard steady-state winds, making it difficult to create classical Wolf-Rayet stars via this channel. However, a remaining key uncertainty regarding these predictions concerns unsteady mass loss for very high-luminosity stars close to the Eddington limit as well as the impact of non-line-driven winds.

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R. Björklund, J. O. Sundqvist, S. M. Singh, J. Puls, F. Najarro. 2022-03-15. New predictions for radiation-driven, steady-state mass-loss and wind-momentum from hot, massive stars III. Updated mass-loss rates for stellar evolution. https://arxiv.org/abs/2203.08218

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